package cn.itcast.com.test;

public class jicheng {
    public static void main(String[] args) {
        B b = new B();
        b.aVoid();
    }
}
class A{
    public float aVoid(){
        return 4.0f;
    }
}

class B extends A{
//    public void aVoid(){
//
//    }
    public void aVoid(double b){

    }

}